A Chattanooga man who already was convicted of manslaughter now faces a homicide charge in a 2012 slaying.

Local police recently arrested 29-year-old Stephen "Dollar Bill" Mobley, who remains at the Hamilton County Jail on a $810,000 bond.

Mobley is accused of killing 29-year-old Gregory Watkins at a gas station on Brainerd Road on June 1, 2012.

Eyewitnesses told police they watched Mobley approach the driver's side of a Toyota sedan Watkins was in and open fire.

Watkins died from gunshot wounds to the chest.

A second person, Lashonda Gonzalez, was wounded, according to a Chattanooga Police Department arrest report.

Police initially arrested 23-year-old Stephen Hill and charged him with Watkins' death. Court records show the case later was dismissed because of a lack of proof.

Mobley previously was convicted in a 2005 homicide case involving 20-year-old Elton Deandra Hall, who was shot and killed at College Hill Courts, court records show. He was sentenced to six years on a lesser charge of involuntary manslaughter and released in June 2010, state records show.